Staggered can mean wider at the rear and thinner at the front AND/OR larger diameter at the rear and smaller at the front; Looking at your set up, it's not size of rims that need changing, but the ride height - your car looks like it's quite high up, judging by the gap between your tyre and the arch, when viewed from the side - if a snugger fit is the visual aesthetic you desire, perhaps consider some lowering springs as a first option - would make your car lower and change the look of it, perhaps more than you'd think?>?
just my two cents - beauty is in the eye of the beholder!